Actually it was not tessa but the original document that was at fault.
I suspect you may be right that the 0 should not be there but it was in the
document.
In any case look at these
conc = c(10, 20, 30, 40, 50)
signal = c (4, 22, 44, 60, 82)
lm.r1 <- lm( signal ~ conc)
summary(lm.r)
conc = c(0,10, 20, 30, 40, 50)
signal = c (4, 22, 44, 60, 82, NA)
lm.r <- lm( signal ~ conc)
summary(lm.r)
John Kane
Kingston ON Canada
-----Original Message-----
From: askib...@gmail.com
Sent: Fri, 9 Nov 2012 20:35:05 +0100
To: jrkrid...@inbox.com
Subject: Re: [R] lm function - strange error
Hi Tessa, I agree with John. I think you've made a typo, but looking at your
data I think the zero concentration should not be there. Try plotting it.
conc = c(10, 20, 30, 40, 50)
signal = c (4, 22, 44, 60, 82)
plot(signal~conc)
abline(lm(signal~conc))
2012/11/9 John Kane <[1]jrkrid...@inbox.com>
Tessa,
Would you please leave in the context --that is your early remarks and
mine?
Most of us on the R-help list do no use nabble and it is really annoying
to have to go there to see what was discussed. I suspect that a lot of
readers just don't bother and nabble users lose a lot of possible help
that way.
In any case, I think your problem is a typo in the document.
My first suggestion gives exactly the same results shown in the
document you supplied. Run this :
conc = c(0, 10, 20, 30, 40, 50)
signal = c (4, 22, 44, 60, 82, NA)
lm.r <- lm( signal ~ conc)
summary(lm.r)
I hope this helps.
John Kane
Kingston ON Canada
> -----Original Message-----
> From: [2]tesara...@gmail.com
> Sent: Fri, 9 Nov 2012 09:36:23 -0800 (PST)
> To: [3]r-help@r-project.org
> Subject: Re: [R] lm function - strange error
>
> Here is the document
>
>
[4]http://www.montefiore.ulg.ac.be/~kvansteen/GBIO0009-1/ac20092010/Class8/U
sing%20R%20for%20linear%20regression.pdf
>
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References
1. mailto:jrkrid...@inbox.com
2. mailto:tesara...@gmail.com
3. mailto:r-help@r-project.org
4.
http://www.montefiore.ulg.ac.be/~kvansteen/GBIO0009-1/ac20092010/Class8/Using%20R%20for%20linear%20regression.pdf
5. http://www.inbox.com/smileys
6. mailto:R-help@r-project.org
7. https://stat.ethz.ch/mailman/listinfo/r-help
8. http://www.R-project.org/posting-guide.html
9. http://www.inbox.com/marineaquarium
10. http://www.inbox.com/marineaquarium
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